<style>
    .nav {
        border:0px solid red;
        width:1000px;
        height:110px;
        margin:20px auto;
        text-align: center;
    }
    .nav ul {
        list-style: none;
        margin:5px auto;
        width:900px;
        height:30px;
        border:0px solid blue;
    }
    .nav ul li {
        display: inline;
        float:left;
        width: 100px;
        height: 20px;
        padding:10px;
        margin-right: 3px;
        background-color: blue;
        text-align: center;
    }

    .nav ul li a {
        text-decoration: none;
        color:white;
    }
    .link-bgColor {
        background-color: orange;
    }
</style>

<div class="nav">
    <h1>用户管理系统V4.0</h1>
    <ul>
        <li><a href="index.html">首页</a></li>
        <li><a href="login.html">用户登录</a></li>
        <li><a href="register.html">用户注册</a></li>
        <li><a href="welcome.action">欢迎页面</a></li>
        <li><a href="updateUser.action">用户详情</a></li>
        <li><a href="logout.action">用户退出</a></li>
    </ul>
</div>
